Lu, D., C. Yuan, R. Mehdi, S. Jabeen, and A. Rashid. “Approximate Solution of Multi-Pantograph Equations With Variable Coefficients via Collocation Method Based on Hermite Polynomials”. Communications in Mathematics and Applications, vol. 9, no. 4, Dec. 2018, pp. 601-14, doi:10.26713/cma.v9i4.844.